Hello everybody that recently commented on this issue (starting with comment #10)!
I believe the core issue is in not in the msttcorefonts package: it is modified on Ubuntu to delegate all downloads to the update-notifier package, which is the one having issues. (That is why installing the Debian version is a quick fix: it does not use update-notifier.)
The update-notifier package itself delegates the download to the apt-helper program from the apt package, which is the one having a problem and which should be fixed.
Have a look at the following issue for the details, and vote on it if you are affected:
Hello everybody that recently commented on this issue (starting with comment #10)!
I believe the core issue is in not in the msttcorefonts package: it is modified on Ubuntu to delegate all downloads to the update-notifier package, which is the one having issues. (That is why installing the Debian version is a quick fix: it does not use update-notifier.)
The update-notifier package itself delegates the download to the apt-helper program from the apt package, which is the one having a problem and which should be fixed.
Have a look at the following issue for the details, and vote on it if you are affected:
https:/ /bugs.launchpad .net/ubuntu/ +source/ update- notifier/ +bug/1655431